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(2/3)*x*(20*x-2) = 0
2/3*x*(20*x-2) = 0
( 2/3*x )
2/3*x = 0 // : 2/3
x = 0
( 20*x-2 )
20*x-2 = 0 // + 2
20*x = 2 // : 20
x = 2/20
x = 1/10
x in { 0, 1/10 }
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